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-rw-r--r--src/lib/formats/vdk_dsk.cpp143
1 files changed, 143 insertions, 0 deletions
diff --git a/src/lib/formats/vdk_dsk.cpp b/src/lib/formats/vdk_dsk.cpp
new file mode 100644
index 00000000000..896815c26ad
--- /dev/null
+++ b/src/lib/formats/vdk_dsk.cpp
@@ -0,0 +1,143 @@
+// license:GPL-2.0+
+// copyright-holders:Dirk Best
+/***************************************************************************
+
+ VDK
+
+ Disk image format
+
+ Used by Paul Burgin's PC-Dragon emulator
+
+***************************************************************************/
+
+#include "emu.h"
+#include "vdk_dsk.h"
+
+vdk_format::vdk_format()
+{
+}
+
+const char *vdk_format::name() const
+{
+ return "vdk";
+}
+
+const char *vdk_format::description() const
+{
+ return "VDK disk image";
+}
+
+const char *vdk_format::extensions() const
+{
+ return "vdk";
+}
+
+int vdk_format::identify(io_generic *io, UINT32 form_factor)
+{
+ UINT8 id[2];
+ io_generic_read(io, id, 0, 2);
+
+ if (id[0] == 'd' && id[1] == 'k')
+ return 50;
+ else
+ return 0;
+}
+
+bool vdk_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
+{
+ UINT8 header[0x100];
+ io_generic_read(io, header, 0, 0x100);
+
+ int header_size = header[3] * 0x100 + header[2];
+ int track_count = header[8];
+ int head_count = header[9];
+
+ int file_offset = header_size;
+
+ for (int track = 0; track < track_count; track++)
+ {
+ for (int head = 0; head < head_count ; head++)
+ {
+ desc_pc_sector sectors[SECTOR_COUNT];
+ UINT8 sector_data[SECTOR_COUNT * SECTOR_SIZE];
+ int sector_offset = 0;
+
+ for (int i = 0; i < SECTOR_COUNT; i++)
+ {
+ sectors[i].track = track;
+ sectors[i].head = head;
+ sectors[i].sector = FIRST_SECTOR_ID + i;
+ sectors[i].actual_size = SECTOR_SIZE;
+ sectors[i].size = SECTOR_SIZE >> 8;
+ sectors[i].deleted = false;
+ sectors[i].bad_crc = false;
+ sectors[i].data = &sector_data[sector_offset];
+
+ io_generic_read(io, sectors[i].data, file_offset, SECTOR_SIZE);
+
+ sector_offset += SECTOR_SIZE;
+ file_offset += SECTOR_SIZE;
+ }
+
+ build_wd_track_mfm(track, head, image, 100000, SECTOR_COUNT, sectors, 22, 32, 24);
+ }
+ }
+
+ return true;
+}
+
+bool vdk_format::save(io_generic *io, floppy_image *image)
+{
+ UINT8 bitstream[500000/8];
+ UINT8 sector_data[50000];
+ desc_xs sectors[256];
+ UINT64 file_offset = 0;
+
+ int track_count, head_count;
+ image->get_actual_geometry(track_count, head_count);
+
+ // write header
+ UINT8 header[12];
+
+ header[0] = 'd';
+ header[1] = 'k';
+ header[2] = sizeof(header) % 0x100;
+ header[3] = sizeof(header) / 0x100;
+ header[4] = 0x10;
+ header[5] = 0x10;
+ header[6] = 'M';
+ header[7] = 0x01;
+ header[8] = track_count;
+ header[9] = head_count;
+ header[10] = 0;
+ header[11] = 0;
+
+ io_generic_write(io, header, file_offset, sizeof(header));
+ file_offset += sizeof(header);
+
+ // write disk data
+ for (int track = 0; track < track_count; track++)
+ {
+ for (int head = 0; head < head_count; head++)
+ {
+ int track_size;
+ generate_bitstream_from_track(track, head, 2000, bitstream, track_size, image);
+ extract_sectors_from_bitstream_mfm_pc(bitstream, track_size, sectors, sector_data, sizeof(sector_data));
+
+ for (int i = 0; i < SECTOR_COUNT; i++)
+ {
+ io_generic_write(io, sectors[FIRST_SECTOR_ID + i].data, file_offset, SECTOR_SIZE);
+ file_offset += SECTOR_SIZE;
+ }
+ }
+ }
+
+ return true;
+}
+
+bool vdk_format::supports_save() const
+{
+ return true;
+}
+
+const floppy_format_type FLOPPY_VDK_FORMAT = &floppy_image_format_creator<vdk_format>;